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Code Issues 15 Releases 21 Activity
312 Commits 2 Branches 21 Tags
d60e2a736b3a227351f4d02b47d695ec3eaad79f
Commit Graph
106 Commits
Author SHA1 Message Date
patrick 69688d1d39 Add integer simplification rule 
This adds the rule “(F in G) === (F = G) if F and G are integer
variables” to the simplification rule tableau
 2018-04-29 22:28:42 +02:00
patrick a70b1fb726 Print typing formulas for integer parameters 
For every integer parameter of the visible predicates, this prints a
formula to the output that makes the integer type of that parameter
explicit.
 2018-04-29 22:28:42 +02:00
patrick b60c65a810 Add option to turn on integer variable detection 2018-04-29 22:28:42 +02:00
patrick 19e1e16e45 Implement integer variable detection 
This adds support for detecting integer variables in formulas.

The idea is to iteratively assume variables to be noninteger and to
prove that this would lead to a false or erroneous result. If the proof
is successful, the variable is integer as a consequence.

The implementation consists of two parts. The first one is a visitor
class that recursively searches for all declared variables in a formula
and applies the second part, a custom check. Three such checks are
implemented.

The first one tests whether a predicate definition is falsified by
making a variable noninteger, in which case it can be concluded that the
variable in question is integer. The second one checks whether bound
variables in a quantified formula turn the quantified part false, again
to conclude that variables are integer. The third check consists in
testing if making a variable noninteger turns the entire formula
obtained from completion true. In this case, the statement can be
dropped and the variable is concluded to be integer as well.
 2018-04-29 22:28:42 +02:00
patrick 43d2c153c7 Represent predicate parameters explicitly 
This adds a vector of Parameter structs to PredicateDeclaration. In this
way, the domain of each parameter can be tracked individually.
 2018-04-28 01:48:39 +02:00
patrick e0509f725a Replace SimplificationResult with OperationResult 
This replaces the SimplificationResult enum class with OperationResult.
The rationale is that this type, which just reports whether or not an
operation actually changed the input data, is not simplification-
specific and will be used for integer variable detection as well.
 2018-04-27 23:37:13 +02:00
patrick 48cf8ee3e0 Minor refactoring 
Reorders some include directives lexicographically.
 2018-04-27 23:35:43 +02:00
patrick f7d99c82fa Move Tristate class to Utils header 
The Tristate class (representing truth values that are either true,
false, or unknown) will be used at multiple ends. This moves it to a
separate header in order to reuse it properly.
 2018-04-27 23:19:42 +02:00
patrickandpatrick 618189368c Split functions from their declarations 
This splits occurrences of functions from their declaration. This is
necessary to flag integer functions consistently and not just single
occurrences.
 2018-04-27 17:59:10 +02:00
patrickandpatrick d0debc6ad1 Split predicates from their declarations 
This refactoring separates predicates from their declarations. The
purpose of this is to avoid duplicating properties specific to the
predicate declaration and not its occurrences in the program.
 2018-04-27 17:55:59 +02:00
patrickandpatrick e15a6b2e88 Remove Constant class 
Constants are not a construct present in Clingo’s AST and were
unintentionally made part of anthem’s AST. This removes the unused
classes for clarity.
 2018-04-27 17:08:41 +02:00
patrick 8c250f5c59 Support modulus operation (absolute value) 
This adds support for computing the absolute value of a term along with
an according unit test.
 2018-04-12 00:38:48 +02:00
patrick 797660d6de Add new simplification rule 
This adds the rule “(not F [comparison] G) === (F [negated comparison]
G)” to the simplification rule tableau.
 2018-04-11 21:39:27 +02:00
patrick 40ddee8444 Add new simplification rule 
This adds the rule “(not F or G) === (F -> G)” to the simplification
rule tableau.
 2018-04-10 22:34:47 +02:00
patrick 6f7b021712 Add new simplification rule 
This adds the rule “(not (F and G)) === (not F or not G)” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
patrick 23624007ec Add new simplification rule 
This adds the rule “not not F === F” to the simplification rule tableau.
 2018-04-10 22:34:47 +02:00
patrick 6d7b91c391 Add new simplification rule 
This adds the rule “(F <-> (F and G)) === (F -> G)” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
patrick b88393655a Iteratively apply simplification tableau rules 
With this change, the tableau rules for simplifying formula are applied
iteratively until a fixpoint is reached.
 2018-04-10 22:34:47 +02:00
patrick c4c3156e77 Move simplification rule to tableau 
This moves the rule “[primitive A] in [primitive B] === A = B” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
patrick 107dae7287 Move simplification rule to tableau 
This moves the rule “exists () (F) === F” to the simplification rule
tableau.
 2018-04-10 22:34:47 +02:00
patrick 827d6e40fe Move simplification rule to tableau 
This moves the rule “[conjunction of only F] === F” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
patrick 4a85fc4b23 Move simplification rule to tableau 
This moves the rule “exists ... ([#true/#false]) === [#true/#false]” to
the simplification rule tableau along with “[empty conjunction] ===
 2018-04-10 22:34:46 +02:00
patrick 7e3fc007c8 Move simplification rule to tableau 
This moves the rule “exists X (X = t and F(X)) === exists () (F(t))” to
the simplification rule tableau.
 2018-04-10 22:34:46 +02:00
patrick 5c5411c0ff Implement simplification rule tableau 
This implements a tableau containing simplification rules that can be
iteratively applied to input formulas until they remain unchanged.

First, this moves the rule “exists X (X = Y) === #true” to the tableau
as a reference implementation.
 2018-04-10 22:34:46 +02:00
patrick e64b2e70de Remove unused captured lambda reference 2018-04-08 20:44:43 +02:00
patrick c294a29cb2 Support placeholders with #external declarations 
This adds support for declaring predicates as placeholders through the
“#external” directive in the input language of clingo.

Placeholders are not subject to completion. This prevents predicates
that represent instance-specific facts from being assumed as universally
false by default negation when translating an encoding.

This stretches clingo’s usual syntax a bit to make the implementation
lightweight. In order to declare a predicate with a specific arity as a
placeholder, the following statement needs to be added to the program:

    #external <predicate name>(<arity>).

Multiple unit tests cover cases where placeholders are used or not as
well as a more complex graph coloring example.
 2018-04-08 20:28:57 +02:00
patrickandpatrick 22238bb398 Switch to C++17 
With C++17, optionals, an experimental language feature, were moved to
the “std” namespace. This makes C++17 mandatory and drops the now
obsolete “experimental” namespace.
 2018-03-24 16:09:52 +01:00
patrick 5f8c144628 Fixed regression in simplifying predicates with more than one argument. 2017-06-12 18:27:39 +02:00
patrick 1f1006ea96 Corrected hiding predicates that are simple propositions. 2017-06-12 15:40:02 +02:00
patrick a4cd133ba7 Correctly implemented hiding predicates with nested arguments. 2017-06-12 02:25:04 +02:00
patrick bbbd0b65a4 Added new option --parentheses=full to make parsing the output easier. 2017-06-06 02:02:26 +02:00
patrick 0285c1cbbb Renamed internal variables for clarity. 2017-06-06 01:44:44 +02:00
patrick 95984f0447 Added warning when attempting to use #show statements without completion. 2017-06-05 04:24:00 +02:00
patrick 7ae0a1f289 Removed unnecessary parentheses after simplification. 2017-06-05 03:58:39 +02:00
patrick 3b26580815 Minor formatting. 2017-06-05 03:54:17 +02:00
patrick 14abc37116 Implemented #show statements for completed output. 2017-06-05 03:02:22 +02:00
patrick 4fd143ef64 Added simplification rule “exists X (X = Y)” → “#true.” 2017-06-05 02:41:17 +02:00
patrick 7bf5d3867d Minor clarification on side effects of a function. 2017-06-05 00:19:43 +02:00
patrick ab71e8eb0a Minor refactoring. 2017-06-04 20:55:25 +02:00
patrick dcc504ebc0 Added another simplification step after completion. 2017-06-04 20:55:24 +02:00
patrick 381d55b6ed Minor formatting fix. 2017-06-01 16:16:06 +02:00
patrick 2bc60d3eea Started implementing support for #show statements. 2017-06-01 04:05:11 +02:00
patrick cdcee897ec Added missing error message when input file does not exist. 2017-06-01 03:29:09 +02:00
patrick 4baed6fbc6 Added back completion support. 2017-06-01 02:37:45 +02:00
patrick 0d8b1e94da Refactored error handling. 2017-05-31 18:03:19 +02:00
patrick 1de0486989 Removed unnecessary namespace identifiers. 2017-05-30 18:13:31 +02:00
patrick 664a57ec68 Fixed issue with multi-layer variable stacks. 2017-05-30 18:09:33 +02:00
patrick 7aad8380d1 Refactored logging interface. 2017-05-30 17:19:26 +02:00
patrick 8214d7837a Fixed incorrect variable declaration look-up in variable stack. 2017-05-30 16:40:14 +02:00
patrick 2964dd1309 Restricting variable stack look-up to user-defined variables. 2017-05-30 16:39:44 +02:00